Action: Semi Auto - Caliber: .40 S&W - Magazine: S&W M&P - Finish: Black - Sights: Fixed - Accessory Mount: Picatinny Rail M-Lok - Twist: 1:16 - Barrel Length: 16.25 - Barrel Threads: 9/16-24 - Overall Length: 29.25 - 30.5 - Weight: 4.25 lb - The polymer of the weapon is made of an impact modified glass reinforced Zytel. Two integrated Picatinny rails come standard on the SUB-2000 forend for mounting compatible accessories. The forend also includes five mounting slots per side configured for various M-LOK accessories. - The stock can be adjusted to three different positions for shooter's comfort. Each position adds approximately 5/8 of an inch to the overall length of the weapon with a total extension of 1.25 inches in the further rearward position. The stock includes a single point sling loop attachment a slot for adding a nylon sling loop (1.25 wide is ideal) and a Picatinny rail on the bottom for adding small accessories. - The SUB-2000 features a push-bolt safety located behind the trigger on the grip assembly. The bolt can be locked in the rear position by cycling the bolt to the rear and rotating the operating handle up into the cutout on the receiver. The rear sight is of aperture type and the AR style front sight can be adjusted for windage and elevation. - The thread protector on the SUB-2000 is removable if the shooter desires to replace the thread protector with a compatible accessory for the 9/16-24 threads. The SUB-2000 can easily be disassembled for cleaning or inspection without tools.